Cache FileStatus in Footer to reduce redundant NameNode RPC calls

### Describe the enhancement requested

Optimization reduces redundant getFileStatus() RPC calls to the NameNode
when processing Parquet files.

Benefits:
- Reduces NameNode RPC calls by 1 per Parquet file during split generation
- For workloads with thousands of small files, this can significantly reduce
  NameNode pressure and improve job startup time
- Maintains full backward compatibility with existing code paths

### Component(s)

Core